Warp stop mechanism for looms



No. 622,630. Patented Apr. 4, I899.

J. H. mmmnw.

WARP sToP MECHANISM FOR Looms.

(Application filed Nov. 25, 1898.)

(No Model.)

Nl'IE STATES JAMES H. NORTHROP, OF HOPEDALE, MASSACHUSETTS, ASSI GNOR TO THE DRAPER COMPANY, OF SAME PLACE AND PORTLAND, MAINE.

ARP STOP ECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 622,630, dated April 4, 1899.

' Application filed November 25, 1898. Serial No. 697.324. (No model.)

To ctZZ whom it may concern.-

Be it known that I, JAMES H. NORTHROP, of I-Iopedale, county of l/Vorcester, State of Massachusetts, have invented an Improvement in Warp-Stop-Motion Mechanism for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

In the type of warp-stop-motion mechanism for looms forming the subject-matter of United States Patent No. 536,969, dated April 2, 1895, the harness or heddle frames are provided with series of thin flat steel detectorheddles normally controlled by the warpthreads and having a limited vertical movement relative to the frame.

The detector-heddles, as they may be termed, inasmuch as they serve as heddles and also as actuating-detectors for the stop motion mechanism, are usually made of hardened steel to combine lightness and strength with resistance to wear by the warp-threads, and in practice they frequently become magnetized, When magnetized, they tend to stick together, and some will lag-behind others of the series during the reciprocation of the frames to efiect the change of sheds, and this irregular and improper operation of the heddles results in impaired quality of the cloth being woven.

My present invention has for its object the production of means for insuring the uniform and proper operation of heddles acting also as actuating detectors in warp-stop-motion mechanism without interfering in the least with their detecting movement upon breakage or undue slackness of a warp thread or threads. I am also enabled by myinvention to maintain the heddles in a more nearly vertical position, an important point when weaving goods with a heavy strain on the warpthreads.

Figure 1, in front elevation, represents a sufficient portion of a loom to be understood with my invention applied thereto; and Fig. 2 is a cross-sectional View thereof, taken on the line co m, looking toward the left.

The stands A. 011 the loom-frame A. provide bearings for an overhead shaft a, having sheaves a, to which are attached flexible c011- nections or straps or? between the harness frames, the latter comprising upright side bars 19 and top and bottom bars 1) b the latter connected to the usual actuating-treadles, (not shown,) all of well-known construction in the type of warp-stop-motion mechanism referred to, as are also the normally-vibrating feelers f f mounted on the rock-shaft f, stoppage of a feeler by engagement with an abnormally-positioned detector-heddle operating by or through suitable means (not shown) to stop the loom.v

I have shown a series of metallic detectorheddles d, having warp-eyes CV and provided near their upper ends with longitudinal slots d to receive the supporting-bar, which in the present instance is the top cross-bar b of the frame, the slots being longer than the depth of the bar in order to permit the detecting movement of the heddle, as in the patent re ferred to.

In order to effect the movement of the detector-heddles in unison, I have applied an evening device thereto below the warp-threads, herein shown as a rod or bar 1%, passed loosely through longitudinal slots d located below the warp-threads and near the lower ends of the heddles, said evener being supported by the series of heddles and resting on the bot toms of the slots (Z The weight of the evener is sufficient to overcome any tendency of some of the heddles to stick up higher than the others, for on the downward stroke of the frame the weight of the evener would come upon any one or more of the heddles which lagged behind the others and the lagging heddles would be positively depressed with the others.

From an inspection of the depressed heddles in the rear series, Fig. 2, it will be seen that the evener in no way prevents a heddle from dropping the length of its slot upon failure or undue slackness of its warp-thread, as at such time the other heddles will support the evener.

When weaving goods with a heavy strain on the warp-threads, there is a tendency to by a separator b extended across the loom and forming a back-stop for an abnormallypositioned heddle when engaged by one of the feelers.

The evener-bar m is provided at each en beyond the series of detectors with a trans verse pin or stop m which serves to limit the side play or movement of the detectors.

4 Having fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a warp stop-motion for looms, a series of actuating-detectors movable into operative position by breakage or undue slackness of the warp-threads, a reciprocating support for said detectors and relatively to which they have a limited independent vertical movement, and an evening device supported by the detectors below the warp-threads, to insure normal movement of the detectors in unison.-

2. In a warp stop-motion for looms, a series of detector-heddles each longitudinally slotted near its ends and provided with a warp-receiving eye, a reciprocating support for said heddles extended through the upper slots thereof, the heddles having limited vertical movement relative to said support, and an evener-bar extended through the lower slots of the heddles and suspended by the latter below the warp-threads.

3. In a warp stop-motion for looms, a series of Ion gitudinally-slotted detector-heddles having each a warp-receiving eye, a reciprocating support for said heddles extended through the slots thereof and of less depth than the length of the slots, and an evenerbar suspended by said heddles below the warp-threads, a heddle released by breakage or undue slackness of its warp-thread having a limited longitudinal movement independent of and relative to said evener-bar while the latter is supported by the remaining heddles.

4:. In a Warp stop-motion for looms, a series of longitudinally-slotted detector-heddles having each a warp-receiving eye, a reciprocating support for said heddles extended through the slots thereof and of less depth than the length of the slots, and an evenerbar suspended by said heddles below the warp-threads, a heddle released by breakage or undue slackness of its warp=thread having alimited longitudinal movementindependent of and relative to said evener-bar while vthe latter is supported by the remaining heddles, said evener-bar having a stop at each end thereof beyond the series of heddles, to limit the side play of the latter.

In testimony whereof I have signed my name to. this specification in the presence of two subscribing witnesses.

JAMES H. NORTHROP.

Witnesses:

GEO. OTIS DRAPER, ALBERT H. OoUsINs. 

